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  <title>ol-ext: Touch compass interaction</title>
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  <a href="https://github.com/Viglino/ol-ext" class="icss-github-corner"><i></i></a>

  <a href="../../index.html">
    <h1>ol-ext: Touch compass interaction</h1>
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  <div class="info">
    The <i>TouchCompass</i> interaction is intended to be use on touch devices.
    <br />
    It lets you handle movement by dragging a touch compass.
    <br/>
    This example shows how to move a point on the map by dragging the compass thus the finger don't mask the point it  is moving.
  </div>

  <!-- Map div -->
  <div id="map" style="width:600px; height:400px;"></div>
  
  <div class="options">
    Select a point then drag the compass to move it!
  </div>

  <script type="text/javascript">

  // Two base layers
  var layer = new ol.layer.Geoportail({ layer: 'GEOGRAPHICALGRIDSYSTEMS.PLANIGNV2' });

  // GeoJSON layer with a preview attribute
  var vectorSource = new ol.source.Vector({
    url: '../data/fond_guerre.geojson',
    projection: 'EPSG:3857',
    format: new ol.format.GeoJSON(),
    attributions: [ "&copy; <a href='https://data.culture.gouv.fr/explore/dataset/fonds-de-la-guerre-14-18-extrait-de-la-base-memoire'>data.culture.gouv.fr</a>" ],
    logo:"https://www.data.gouv.fr/s/avatars/37/e56718abd4465985ddde68b33be1ef.jpg" 
  });

  var vector = new ol.layer.Vector({
    name: '1914-18',
    source: vectorSource
  });


  // The map
  var map = new ol.Map({
    target: 'map',
    view: new ol.View({
      zoom: 6,
      center: [173664, 6166327]
    }),
    layers: [layer, vector]
  });

  // Select interaction
  var sel = new ol.interaction.Select()
  map.addInteraction(sel);

  // Add touch compass interaction
  var tcompass = new ol.interaction.TouchCompass({
    onDrag: function(delta, e){
      /* Move the map * /
      var c = map.getView().getCenter();
      map.getView().setCenter([ c[0] + delta.traction[0]/50, c[1] + delta.traction[1]/50 ]);
      /* or move a selected feature */
      var f = sel.getFeatures().item(0);
      f.getGeometry().translate(delta.traction[0]/50, delta.traction[1]/50);
      /**/
    }
  });
  map.addInteraction(tcompass);
  tcompass.setActive(false);

  sel.getFeatures().on(["add","remove"], function() {
    tcompass.setActive(sel.getFeatures().getLength() > 0);
  });

  </script>
  
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